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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712473ccfb7e98013c7d014f04a81c80ec7eef7b18995f74d9711d1dfec78d28' 
  AND token = 'SaBERu+cghbjyoULZLSjwXk+ujkQD3QVEvXt/5oE/KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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