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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d7279df0ac752613de68237c34048ddc4fd85188c194f3e260d358c5491a15' 
  AND token = 'YGcxoCtbOA/OLDfVgejgP6793arsXm9uTHu2I0D+B1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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