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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ecef9f0b617314b86502ad3a37aa1893639560cc85712cc63ba7bde6552579' 
  AND token = 'vYmkkZtCLiwHPEB53cA4pmwy+C5KE7o7almiUTDlF/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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