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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6387c357a2101fd35e3fcc5938a9dfeeae5725f0662ef9ec6792564ef40deb' 
  AND token = 'dGV/n1E7G1OWFn1LrYYFmKv7Nsb1BOFJ0Mx0hhqEp6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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