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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659791b223e7ae90a9bb8ac369aa37e4f04fd01e5ba5692f996753e77bf36071' 
  AND token = 'SCKvEpJ8HNPTceO4pxOrW87LmFmVvJKTWlanKfpgoxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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