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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05db244966a0b9571819a004d871422940366f190872d9f5ad2086ba55366e5b' 
  AND token = '5XNTrePCOM9vrwL7PTsYB7Nt4alINolex7JjlGjEhG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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