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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81921425e79cf2cee2a29fc7b784f16f1fb9e236645ab50a02a2e383cfe92f5' 
  AND token = 'jL5LPkDmcUCHhtpqn5eyL3oxd2wukenus4x2k45XFFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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