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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac83512013e41a04b46499e6dfdfa5973e02930f34ff007b79b7d632e182404b' 
  AND token = 'BOM4ohfhG7aiTQ21p1T3PEipON3YnQHVO3rIYuWlafU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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