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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f920ce098a31006b89e08d856f1c028fd332b91de5fbe6d13f115a5d5f26586e' 
  AND token = 'Zuos4aRpFwqeAGKltcmXKJxilZj8xR26gQpbwBqjqRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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