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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ba2c52e877e8f46ec871a6fb9c9674fcc300f581f311b7639b82878360c8e7' 
  AND token = 'sH8+8IG4hHieDlCg8zPnHsiTfWIRSEGuspwJwb0JHUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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