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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83be9e5d5c6d2f01f554d484c5748efb56ab422d13fc591814dc86cec213612' 
  AND token = 'KRjsbrF6KI4vtr0Cs4ff9knLoFw7PLdmcBMmCeCp8M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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