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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0af6717ef826e703da743f2146eec81977f45b0e85c14596365bc10b55c649' 
  AND token = 'gHNMBlennb4DzTXjoMdrLzxTQT0A89/cmUPNFfb8PI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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