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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1093388c134e40f3e82a4e4a529fbd5b8497c25337226be4ccf52751cbf553' 
  AND token = 'XbEFF5FOapBvLvbK+ZlCeEeM1frnG/lk88ZpRqUn5b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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