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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9ed8dec8a7d96450b01623b3a6823fb443cc6548f07066641f5df4de8dfd35' 
  AND token = 'D9Y/eyh0aFL/58j9OF7foSSumlGcxPSqikQF51trGQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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