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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c67fd12a9b881d91b3ae06a7ff51381716de23c0cbd77d2a5857867846c4c9f' 
  AND token = 'v77Q9pu4i2z7VA9V3busd6SLV51nmvt59XHpi67yvE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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