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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968c71a8d8e605d9ae7103819981cb4327e84ba56467ad7fca3238d2f5930684' 
  AND token = 'VuC1uD5D3jm7+cK3/rTrHFAZUoHqHBNHcQppic1pfi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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