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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08435fe616a062961db9846e6d1a2142944bd31a70f317315b89cdc088432fb0' 
  AND token = '+aygJ1aFSSmLkmQ7x+hMuzP4nobrLffhbCDFfmEG/o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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