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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520c285d9be993411d6f0ef848a314a0e63b783db3563ef4aa0b58a47a387b25' 
  AND token = 'T6Ts/84NQ2UlXyzDAEGMyro8w62uvYJJkvQ7ZZt4fzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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