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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a960de2d8371b8b88c5ffb98de6b4272cd44313b4807b9af0330ebbf652fe6' 
  AND token = 'nX+ln69nAH9Nl4eZWZOyzHTkNSTbBC+R0I/cOcEq/kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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