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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5fa082d7a18704e2d78e865bd6f43a8198af1cb6ad57515ebd519aabb5a9de1' 
  AND token = 'zV8Bk1hApuclKHtiLdxfQI9rX5AW1l012q+nLbNidDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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