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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397898ea8b416fb0d8ba9cb546c5a71d7f10b353b1abe1f671447128cef268e9' 
  AND token = 'Oq93BC3NNSVId88dIaagjx0q43ftYY6DHc4uH+u43eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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