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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70c308e5d99163c5e5800a9fd80d160d5d6db42fc8874400d6debd66bbe5a28' 
  AND token = 'nVZZd40c/1T411vpA2sQDoNRtgXD3QIdZpTu55XAQes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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