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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5eab17353140a9af9718819243793e927e5392f88c4254534c500359b2113f' 
  AND token = 'JweXgVYrdPPQ0PcXMZ7IP3C/Ab1tY1dKRx0VeYyCilU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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