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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2649cbaddf95fd6c186b3ce6a6721430a2f17e4c9ccd9411b6eac5610a3bbbf' 
  AND token = '8S+b/mrCu3A1XwKtrTH+P6Lg77cAJW8TiUkjVFAcgdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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