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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afcbd2a26811c599ff71d9709395401a309daaec446f337aaa2e2ccd58c16d43' 
  AND token = '2aVqZsO5/Oh2Y5rfZK6iu9LF1Y6eAS6wFO3OUJUA/2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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