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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc3d2b0a28b15c304200b94925d38ad2f3c72130a435993a614fca7f14c7fa2' 
  AND token = '+09ntRLNEQP48EsYQuGyPLYCrsg/NHMxDIkaD8CT4jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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