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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1fe0f6db803975fcd10fee54435c0ae3297599ab40385b118152a7697fc3a8' 
  AND token = 'yI0e/Jel73hpBsLuqqK0cLSWQvOrUUP/p3c5MbLRsTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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