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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2449a90bd2ab56fcd5592bf85503f0ee0c3906917c2e5586ff23959e552ec68e' 
  AND token = '7UWYquPj7UVNXTSyU4V9TeJVLnodEJ/bygO3b0GM9xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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