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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cedadbcf565e79c1dd58206dc5fd3a8915e60df89aa50b153d697e57bf53bdbb' 
  AND token = 'PSvF5576jsyxEVkNb8q8UZrLaqU1wAoTD42MBT+kmYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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