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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae630e3852290eec50a36b05ce15e8faa14b775d694b2435ec90c6bc2e52db47' 
  AND token = '1PJhQFndIamaJCAnVBfmIAgAR5q2faTCuxvm8gDv44s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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