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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '543745a85862a52f86d6fa786d14b888795d224b97ccf0c60876846f0b0ec07e' 
  AND token = 'sOiVddR/OApusx0Rq0b7yt115taYZni+BOujRhNV3ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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