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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da152eb3d7650d693baef8de7c6e43c9fe099f078dbc19efc0a1ee1855f66c65' 
  AND token = 'szMXUK1MoweWBWPM4UskhE4BJ1XHSNRodXgiUZnGxKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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