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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6a490f0cc0db7f2313855a326ef0cb22752454c43ef1787f31c78635fe3421' 
  AND token = 'Q5xRFeFYwMHg5IYE+GhkR9yNw2za7OACex3R9k/Buss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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