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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f510afa0f6f815e8a6536ec1d2d18cb25a1053abb66fe8d4fff289a6f205d2' 
  AND token = 'v+/INYxaPu5VY9avI7b9OTru/TJkynlYIREJWw6Wmy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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