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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e732cffd5f68320f1a997fc62a9bf6f85c31b66637b40674da25359a1430c9' 
  AND token = 'a6971VbL9NdFvMEGKo6l0seFHtEaHMHkc9sBclmyOOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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