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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef98485ab8c1797a86db685b482017b03711918af4d001aa6ee96151a64340d7' 
  AND token = '/EEUYJQw7xeGhV0/N+wZHPmREfO+9ENHQaUqIHH3Qdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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