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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b835b57cf24e2a77619749a94967f1f938170a7e4d9ff844dddc661959be5a38' 
  AND token = 'mRfyq3mKW9Kg9gFPFx8RKHN96IV7HRWHiZX6tiij5OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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