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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0b920feecbe58627cf3c8898e54106c9dd5d907e6978602c36ac1e0ee47f0a' 
  AND token = '6f/72b0rBSfbChOmR9yzkeJGldDLP0OKc5FcFLvRpkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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