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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b448d0b9a1fdd4996de9074d18cc913c915f28ac31ebcbb2dad9cc051da4b69c' 
  AND token = '1YCcOMupbGMqJ5BFen18TwCUDKUSoqtrTfICC8/OSzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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