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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6828699e7a8715db196c89d0553611cdf8b19b8e2f2e550f34ae07e5c0656a21' 
  AND token = 'J0N30PeVW5vYy13lZlBrdr6/lkparAQppjijmA1Nib4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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