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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09060d1b7c6710b8edff85e8014dfa5c726f1baf8aa0cb11e64a9057430e158' 
  AND token = 'uduJ0fSMy9z9So7TYIZklvAXqQq5rDWX4yuSU3aojag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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