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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8fc254a418c7a6a5ff6987b2aaad7b52ed42f4e30af015307a8de1ca174dda' 
  AND token = 'dSli8KYqdCsSubb4SBuP7RYOX7zqF7aKB5FEZT6iwkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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