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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda139390895a3f6c65f819a46de5811070c207bc5e5be1b6a45725c290b3eb8' 
  AND token = 'l95HrWv0NRKPgm1RA2Xma7Evgc2YC3QBkjuMfZ+O3Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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