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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd44096f406a4bc9ebc1821d99526f8a67e8772e2eb06953dd06da5779a6609c' 
  AND token = 'Velt7Mzu0Eag/xUmihJKUlJZrCXq5dXyKXzydaJW8m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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