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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b201a764729bd3541c5f3efb2fcfbfb82ae3f366a77b2cd5ca34e2d9a5e7a219' 
  AND token = 'T+wvF/sNU9Qe6L4s6v42q/rSqm1peDrxCXtP1RKXHnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}