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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794fb5714312cb058bb1318fc397c50628e31daa16d8ef647cc6e6825c9233e7' 
  AND token = '0uhnkyQmJkAIXQQTX4EdDVtAO3ng+curmS4cSxtUCZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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