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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c637c1213b464de130b00ee5df1b6f9350a864bd6ad86a0219b5e33e1250f2' 
  AND token = 'zsaOafHniru6jb8iWKFO+8JQ0UxO3jP4UqJM7ilZL1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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