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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b11939357ae91ff5abc1ee2b90eb19d3246c791db4ee24b9e304041de96a2b' 
  AND token = '6oki+GWvPtelbAhx9Nmo8CvHpQq3p/EvOosi08LannY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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