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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87e67cfa455081605e19bca50b300782be1cc8a2baa2c07054db8a20bc742c3' 
  AND token = '7D2vI/E5pGDPxWrqso4/vsWrAwm3Ef7DYon7l0MkKZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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