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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4828aee1d3c46f50fb54a4f0dcfd9b49cda6fb6524c3de17a8554693b56a3d3c' 
  AND token = 'AUb5JHJdAn00GWLGdNaCgywG/8T4qfeVNqFNgAsA7pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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