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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcacaa3e049f2104da9d113f48facc2f6a05cec6cb596abec163e06f043336dd' 
  AND token = 'BsbGYUnm5y03D4gE7gCeD3RKbiddWSdFwZM8xf+C8vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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