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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea3867a0585a8c42cdfd44d39e3b3ee7eb5ae686e3e1420a5cccfa1a71e333a' 
  AND token = 'NXonl6tEaVxqA0EIL4W3sOYtDikOg/NDThI8DGJv9i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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