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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00dac86b683a43701f946acc84d4c32d6996523ee565d0d93033af085aad3b7b' 
  AND token = 'HtP8haEwuXt99dS7sOdCXI2q2GwfLIX0vzpKa3spH3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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