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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd5a98ddf1a725044e5e5bbd99541f25a2b07c7a23285a7f4844bb93c1d6b8b' 
  AND token = 'Dn0olDr7RC+YsTVBypa1sC3m1z7KlcLRD4bbDQ/8x7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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