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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e488212b94a9cfd4e928b67e4f0d04fc7db34586fedf0c31904d8fdcec5f9d5a' 
  AND token = 'VStELspl0R7mpoo9MyFU9LJttZxH536TtdpiAO5i5Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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