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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fb244510b2332dc9eef1de1c4d51b808f36473fa153f08d3305ce869481645' 
  AND token = 'NgOLyHJbKX650c1SEoBLiVE+3+SqBJqDY05ZidZ6G9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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