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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213e91d08d9ecaa4a45e82801b67a886f8449487ce72f063195930e95da5bf0c' 
  AND token = '4w/L/vS/qPkPTW3kDvTwLvUEdzqtqK5D3b6JLzF19hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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