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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b786a7af84cce2fc505bc1f449298abb8c2b8f4ba9f94aa125078c22f87a7d30' 
  AND token = 'RZS7ZEte0l0KXjR41nVOgfG/O1fw6yX83XHSdblf1b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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