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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10266276adc2b2eadfe340fecf239d537db23071c6bf80bc91eb6c426caa779e' 
  AND token = 'BTjlsOab7pwOZ92baoq+MoC68HcWQbcQ9qOXbRQ5GNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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