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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30febb8f09eb99556022000522de9238b8771c788c77419f526f22cc0bc37dea' 
  AND token = '8zcEfzAnA0FVPLMWOVcqL/R2bulc/GLeyJCqxMBzAzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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