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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8aad634abc3908be46a63baba393d3e40b7d2ce925df6ef639efbb93e402eb3' 
  AND token = 'sYlFBZwhc1HLW1AHVO9fLX0JqN98OQE3RP1pdQd/i40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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