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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150a442493f56a2b37b2138ca5fe861d2cb9b84732192c2b80c974400d75d82a' 
  AND token = 'PK/0S1SqKJLHk9AWT9kbYH17QDOUS2ggmtM3GczBSwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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