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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e718f407378ff699814f1c484bbdb20024f0535d4f3beed7a04df2b79d50d649' 
  AND token = 'Hw8QASNuea8JE1iK8/4EDBaxmEzrHJbOcQMCHTUd9wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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