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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e7b493c96f042a737cf0d553b674c7d2b1c1e23f3312b6070ccae69130c420' 
  AND token = '29hrf6h5tKX4QKe71nTdj5r8644GPnSxsYvUu+yPE9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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