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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86603eb5d619909e127a9e02050dbf20a5739441a98712725ec0468447cb1d0' 
  AND token = 'gcqdQT/Julw73Z2qOOKyDacZW9YWchh9EOylqO3Ro90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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