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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470ea48a44fc9fdbafd7ca199e398f5d8a04e4881152e474ceaaba779dc2ddda' 
  AND token = 'URcHdDpbUwOHt7wIJac7l713LhOBUnsILn/sdrgjkfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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