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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87f343bb5cec842da2f414bda6dd142335f07b561150fb72f55416f351a7c79' 
  AND token = 'I4Q0NcMoYR3uOituugngMviEO7EJe91zsubbKR53d8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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