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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb1be615dc125d838ca26b4f0f4a1a20a66f67f2477a57a8efe9d1e4926a62b' 
  AND token = 'tW3um7sodTAphUCTLXMVibHolnrzExHhOjfPEmrMWgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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