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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c90a58fc0bfea7218a894b6c218d5a8b89e5eb1c5c75129a1548cab39a9a6a' 
  AND token = 'bwMjg1XDwjwYF5XIESJ73jmxI5Df2BHlWkTD4LM8XRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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