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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ac4748598654b5cfb0624961bad11d9fcf3c7418177db5993eb1829f0754e0' 
  AND token = 'g7mCq5Es6KdbGXMTZf4+WAzE9NN9CQ9U9N+nMnraJVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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