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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4edad3c14792d1b9d027ae6daadcf3da8e09eebe2fd34d5ca2eb2478db51db' 
  AND token = 'PsJ6/GcIVuSGtm+rJbXHyfa37pwA+8vMMpFNXfgWtSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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